<template>
	<div>
		<h1>当前求和为：{{sum}}</h1>
			<select v-model.number="n">
				<option value="1">1</option>
				<option value="2">2</option>
				<option value="3">3</option>
			</select>
			<button @click="increment">+</button>
			<button @click="decrement">-</button>
			<button @click="incrementOdd">当前求和为奇数再加</button>
			<button @click="incrementWait">等一等再加</button>
		</div>
</template>

<script>
	export default {
		name:'Count',
		data(){
			return{
				sum:0, // 当前的和
				n:1 // 用户选择的数字
			}
		},
		methods:{
			increment(){
				this.sum += this.n
			},
			decrement(){
				this.sum -= this.n
			},
			incrementOdd(){
				if(this.sum % 2){
					this.sum += this.n
				}
			},
			incrementWait(){
				setTimeout(()=>{
					this.sum += this.n
				},500)
			}
		}
	}
</script>
<style lang="css">
	button{
		margin-left: 5px;
	}
</style>